If there are water stains or foreign matter on rubber packing 1, 2 or 3, clean the part(s) with water and finger scouring.

Check that 1, 2 or 3 is not deformed, cracked or swollen.

Check that 3 and 4 are not stuck together.

Apply engine coolant to 2 and 3 before using the radiator cap tester.

When using the cap tester, tilt it more than 30 degrees.

Pump the cap tester several times, and check the maximum pressure*1.

• Pumping speed:
• 1 pump per second

• HINT:

• *1: Even if the cap cannot maintain the maximum pressure, it is not a defect.

• Judgment criterion:

• Item	Specified Condition
  Standard valve (for brand-new cap)	93.3 to 122.7 kPa (0.95 to 1.25 kgf*cm2, 13.5 to 17.8 psi)
  Minimum standard valve (for used cap)	78.5 kPa (0.8 kgf*cm2, 11.4 psi)

If the maximum pressure is less than the minimum standard valve, replace the radiator cap sub-assembly.